Home / 235.80-353.63-81.69

Finding the Fourth Proportional to 235.80, 353.63 and 81.69

Calculator

Solution

The fourth proportional to 235.80, 353.63 and 81.69 is: 122.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.80 : 353.63 = 81.69 : x
  2. Step 2: Convert to fraction form
    235.80/353.63 = 81.69/x
  3. Step 3: Cross multiply
    235.80x = 353.63 × 81.69
  4. Step 4: Simplify right side
    235.80x = 28,888.86
  5. Step 5: Solve for x
    x = 28,888.86/235.80
  6. Step 6: Final answer
    x = 122.51

Related Problems

Find fourth proportional to 117.90, 176.82 and 40.85
Half scale
Find fourth proportional to 471.60, 707.26 and 163.38
Double scale
Find fourth proportional to 236.80, 355.13 and 82.69
Similar ratio
Find fourth proportional to 353.70, 530.45 and 122.54
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.